`URLConnectionStream` is a class in Java that provides a way to read data from a URL connection. It is part of the `java.net` package and allows developers to easily access resources over the internet, such as web pages or files. By using this class, programmers can open a connection to a specified URL and read the data as an input stream. This class is typically used in conjunction with the `URLConnection` class, which establishes the connection to the URL. Once the connection is made, `URLConnectionStream` enables the retrieval of data in a straightforward manner, making it easier to handle network operations in Java applications.